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Extra info for Abstract state machines..A method for high-level system design and analysis

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Updates is a finite set of assignments of the form f (t1 , . . , tn ) := t whose execution is to be understood as changing (or defining, if there was none) in parallel the value of the occurring functions f at the indicated arguments to the indicated value. More precisely, in the given state (see below) first all parameters ti , t are evaluated to their values, say vi , v , then the value of f (v1 , . . , vn ) is updated to v , which represents the value of f (v1 , . . , vn ) in the next state.

Xn ∈ Var , choose v1 , . . , vn ∈ Value forall 1 ≤ i ≤ n do val (xi ) := vi 38 39 The turbo ASMs Quicksort on p. 172 and Mergesort on p. 173 correctly refine this specification. For more details on COLD see Sect. 2. 2 Working Definition 41 Ambiguous grammars. The following ASM illustrates the power of nondeterminism which is provided by the choose construct. It generates for a given alphabet A and a given natural number n > 0 exactly the set of all pairs vw of different words v , w over A, both of length n.

For more details on COLD see Sect. 2. 2 Working Definition 41 Ambiguous grammars. The following ASM illustrates the power of nondeterminism which is provided by the choose construct. It generates for a given alphabet A and a given natural number n > 0 exactly the set of all pairs vw of different words v , w over A, both of length n. It does it in the sense that if all possible choices are realized, the set of reachable states vw of this ASM (where v , w represent the only two controlled functions), started with say vw = ab for some letters a = b in A, is the desired set.